On-line monitoring device and method for concentration and flow of channel type external return sludge in sewage plant

Abstract

The application discloses a sewage plant channel type external return sludge concentration and flow online monitoring device and method, biochemical pools are provided with sludge external return channels, and the sludge external return channels are connected with sludge external return pipes; the sludge external return channels are used for returning sludge to corresponding biochemical pools; the sludge external return channels are provided with wedge-shaped ultrasonic sensors; the wedge-shaped ultrasonic sensors scan sludge in the sludge external return channels, and convert scanning results into electric signals and upload the electric signals to a sewage plant central control room. The sewage plant central control room detects and calculates flow velocity and concentration by comparing the mutual relationship between multiple images or echo modes arranged in time sequence. The application can not only quickly and accurately obtain flow data, but also can realize quick dismounting and maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of urban sewage plant construction and operation, in particular to a sewage plant channel type external return sludge concentration and flow online monitoring device and method. BACKGROUND

[0002] The flow detection in the sewage plant treatment process is relatively single. In terms of detection position, the water line flow detection is generally limited to the water inflow metering after the pre-treatment, that is, after the fine grid well and grit chamber, the water outflow metering at the tail water discharge channel (well) position, and the sludge line flow detection is mostly the residual sludge discharge amount of the secondary sedimentation tank. The detection means mostly adopts the channel type electromagnetic flow meter.

[0003] At the most important unit of the sewage plant, that is, the biochemical tank part, the key parameters affecting the carbon removal, biological denitrification and phosphorus removal, equipment operation energy consumption, biochemical tank single inflow (total inflow distribution to the inflow of each biochemical tank single), sludge external return flow (affecting the biological denitrification and phosphorus removal effect), and sludge external return flow are rarely detected. When participating in control, the flow acquisition method is mostly artificial calculation, which is deduced through the water pump motor speed or working power current, and cannot achieve accurate data. The installation quantity and position are relatively single, and the type mostly adopts the electromagnetic flow meter. Due to the complexity and harshness of the on-site sewage environment, the accuracy of the electromagnetic flow meter cannot be guaranteed in the long-term use process.

[0004] In view of the above reasons, how to solve the defect that accurate biochemical tank return flow data cannot be obtained in the prior art has become a technical problem to be solved by the person skilled in the art. SUMMARY

[0005] In view of the above defects of the prior art, the present application provides a sewage plant channel type external return sludge concentration and flow online monitoring device and method, which realizes the purpose of solving the defect that accurate biochemical tank return flow data cannot be obtained in the prior art, can quickly and accurately obtain flow data, and can realize quick disassembly and maintenance and adapt to water line and sludge line flow detection of various sewage treatment processes.

[0006] To achieve the above purpose, the present application discloses a sewage plant channel type external return sludge concentration and flow online monitoring device, which comprises a biochemical tank and a secondary sedimentation tank. The secondary sedimentation tank is provided with a radial flow type full-bridge scraper suction sludge machine, and the outer side common wall is provided with an external return sludge and residual sludge pump well. The radial flow type full-bridge scraper suction sludge machine scrapes and removes the sludge deposited at the bottom of the tank, and discharges the sludge to the external return sludge and residual sludge pump well. The external return sludge and residual sludge pump well is provided with a sludge external return pump. The sludge external return pump pumps the sludge in the residual sludge pump well back to the biochemical tank through a sludge external return pipe.

[0007] The biochemical tank is provided with a sludge external reflux channel connected with the sludge external reflux pipe;

[0008] The sludge external reflux channel is used for returning the sludge to the corresponding biochemical tank;

[0009] The sludge external reflux channel is provided with a wedge-shaped ultrasonic sensor;

[0010] The wedge-shaped ultrasonic sensor scans the sludge in the sludge external reflux channel and converts the scanning result into an electrical signal and uploads it to the central control room of the sewage plant.

[0011] Preferably, the sludge external reflux channel is provided with a heavy weight pad;

[0012] The lower surface of the wedge-shaped ultrasonic sensor is fixedly connected with the heavy weight pad, and the heavy weight pad is sunk at the bottom of the sludge external reflux channel.

[0013] The wedge-shaped ultrasonic sensor is placed in the channel through the heavy weight pad and will not be washed away by the water flow velocity.

[0014] In actual application, the heavy weight pad is made of stainless steel and weighs 10 kg, which can prevent the wedge-shaped ultrasonic sensor from being washed away and displaced when the channel flow velocity is up to 5 m / s.

[0015] More preferably, the heavy weight pad is connected with a stainless steel hook on the bank of the sludge external reflux channel through a stainless steel chain.

[0016] More preferably, the stainless steel chain is provided with a chain tensioning device.

[0017] Preferably, the wedge-shaped ultrasonic sensor is connected with a field instrument control cabinet arranged on the bank of the sludge external reflux channel through a power supply and control cable, and the electrical signal is uploaded to the central control room of the sewage plant through the field instrument control cabinet.

[0018] More preferably, the power supply and control cable is fixed to the bottom and inner side wall of the sludge external reflux channel through a plurality of stainless steel pipe clamps.

[0019] Preferably, a pool top catenary lifting hoist is arranged on the bank of the sludge external reflux channel.

[0020] The pool top catenary lifting hoist is fixed on the bank of the sludge external reflux channel through a foot.

[0021] A rotating adjusting disc and a stainless steel straight rod are sequentially arranged on the foot.

[0022] More preferably, a stainless steel inclined support rod including a lifting nylon pulley is arranged on the upper end of the stainless steel straight rod.

[0023] The stainless steel inclined support rod comprising the hoisting nylon pulley is provided with a stainless steel sling chain;

[0024] When the sludge external reflux channel is maintained, the position of the stainless steel inclined support rod is adjusted by the rotating adjusting disc, and the wedge-shaped ultrasonic sensor is hoisted by the stainless steel sling chain.

[0025] The present application also provides a detection method of the sewage plant channel type external reflux sludge concentration and flow online monitoring device. The wedge-shaped ultrasonic sensor emits ultrasonic pulses of a fixed angle range every 1 to 10 milliseconds, scans the sludge, collects the positions of 16 layers of micro-particle reflectors in the sludge, and saves the obtained echoes as image or echo mode electrical signals uploaded to the sewage plant central control room.

[0026] The sewage plant central control room detects and calculates the flow rate and concentration according to the positions of the identified 16 layers of micro-particle reflectors by comparing the mutual relationship between a plurality of images or echo modes sorted in time sequence.

[0027] The present application has the following beneficial effects:

[0028] The present application can not only quickly and accurately obtain flow data, but also can be quickly disassembled and maintained, and is suitable for water line and sludge line flow detection of various sewage treatment processes.

[0029] The concept, specific structure and generated technical effects of the present application will be further described below in combination with the drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The structure schematic diagram of an embodiment of the present application is shown.

[0031] Figure 2 The structure schematic diagram of the wedge-shaped ultrasonic sensor arranged in the sludge external reflux channel in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] EMBODIMENT

[0033] As Figure 1 and Figure 2As shown, the sewage plant channel type external return sludge concentration and flow online monitoring device, including biochemical pool 1 and secondary sedimentation tank 2;Secondary sedimentation tank 2 is provided with radial flow type full bridge scraper suction sludge machine, and the outer side of the common wall is provided with external return sludge and residual sludge pump well 3, the sludge deposited at the bottom of the pool is scraped off by the radial flow type full bridge scraper suction sludge machine, and the sludge deposited is discharged to the external return sludge and residual sludge pump well 3;The external return sludge and residual sludge pump well 3 is provided with a sludge external return pump 3.1;The sludge external return pump 3.1 returns the sludge 8.7 in the residual sludge pump well 3 to the biochemical pool 1 through the sludge external return pipe 3.2.

[0034] Wherein, the biochemical pool 1 is provided with a sludge external return channel 12, which is connected with the sludge external return pipe 3.2 through the sludge external return channel 12;

[0035] The sludge external return channel 12 is used for inputting the sludge 8.7 into the corresponding biochemical pool 1;

[0036] The sludge external return channel 12 is provided with a wedge-shaped ultrasonic sensor 8.1;

[0037] The wedge-shaped ultrasonic sensor 8.1 scans the sludge 8.7 in the sludge external return channel 12 and converts the scanning result into an electrical signal and uploads it to the sewage plant central control room.

[0038] In practical application, the shell of the wedge-shaped ultrasonic sensor 8.1 is made of waterproof polypropylene or engineering plastic material, and the insulation mode grade is not less than IP68.

[0039] The present application is suitable for both new projects and existing projects. In the channel embedded installation of high-frequency continuous pulse ultrasonic cross-correlation method flow detection equipment, rapid installation and accurate detection can be realized.

[0040] In some embodiments, the sludge external return channel 12 is provided with a heavy weight pad 8.3;

[0041] The lower surface of the wedge-shaped ultrasonic sensor 8.1 is fixedly connected with the heavy weight pad 8.3, which is sunk at the bottom of the sludge external return channel 12.

[0042] The wedge-shaped ultrasonic sensor 8.1 is placed in the channel through the heavy weight pad 8.3 and will not be washed away by the water flow velocity.

[0043] In practical application, the heavy weight pad 8.3 is made of stainless steel material, and the weight is 10 kg, which can prevent the wedge-shaped ultrasonic sensor 8.1 from being washed away and displaced when the channel flow velocity is 5 m / s at most.

[0044] In some embodiments, the heavy weight pad 8.3 is connected with the stainless steel hook 8.8.6 on the bank of the sludge external return channel 12 through the stainless steel chain 8.8.7.

[0045] In some embodiments, the stainless steel chain 8.8.7 is provided with a chain tensioning device 8.8.8.

[0046] In some embodiments, the wedge-shaped ultrasonic sensor 8.1 is connected to the field instrument control cabinet 8.2 arranged on the bank of the sludge external reflux channel 12 through the power and control cable 8.4, and the electric signal is transmitted to the central control room of the sewage plant through the field instrument control cabinet 8.2.

[0047] In some embodiments, the power and control cable 8.4 is fixed to the bottom and inner side wall of the sludge external reflux channel 12 through a plurality of stainless steel pipe clamps 8.5.

[0048] In some embodiments, a pool top catenary lifting hoist 8.8 is arranged on the bank of the sludge external reflux channel 12.

[0049] The pool top catenary lifting hoist 8.8 is fixed to the bank of the sludge external reflux channel 12 through a footing 8.8.2.

[0050] A rotating adjusting disc 8.8.3 and a stainless steel straight rod 8.8.4 are sequentially arranged on the footing 8.8.2.

[0051] In some embodiments, a stainless steel inclined support rod 8.8.5 including a lifting nylon pulley is arranged at the upper end of the stainless steel straight rod 8.8.4.

[0052] The stainless steel inclined support rod 8.8.5 including the lifting nylon pulley is provided with a stainless steel catenary 8.8.1.

[0053] When the sludge external reflux channel 12 is maintained, the position of the stainless steel inclined support rod 8.8.5 is adjusted through the rotating adjusting disc 8.8.3, and the wedge-shaped ultrasonic sensor 8.1 is lifted through the stainless steel catenary 8.8.1.

[0054] In practical application, the pool top catenary lifting hoist 8.8 can rotate 360° through the rotating adjusting disc 8.8.3, and any wedge-shaped ultrasonic sensor 8.1 at any position can be lifted.

[0055] When the wedge-shaped ultrasonic sensor 8.1 needs to be maintained, the operation of the external reflux pump 8 is stopped, and the wedge-shaped ultrasonic sensor 8.1 is lifted through the pool top catenary lifting hoist 8.8.

[0056] The present application also provides a detection method of the channel type external reflux sludge concentration and flow online monitoring device of the sewage plant, the wedge-shaped ultrasonic sensor 8.1 emits ultrasonic pulses 8.6 of a fixed angle range every 1 to 10 milliseconds to scan the sludge 8.7, collect the positions of 16 layers of micro-particle reflectors in the sludge 8.7, and save the obtained echo as an image or an echo mode electric signal transmitted to the central control room of the sewage plant.

[0057] The control room of the sewage plant detects and calculates the flow rate and concentration according to the position of the identified 16 layers of micro-particle reflectors by comparing the mutual relationship between multiple images or echo patterns sorted by time.

[0058] The present application is different from the electromagnetic principle of installing electromagnetic flow meters in traditional channels or the static pressure difference principle of Venturi flow meters, adopts high-frequency continuous pulse ultrasonic cross-correlation flow detection technology, simultaneously captures the suspended particles (bubbles, colloids, etc.) in 16 layers of the flow cross section, uses the echo patterns of the suspended particles in each layer to obtain the layer flow of each layer through correlation inversion algorithm, then adds the layer flow metering flow of each layer according to the geometric properties and size of the flow cross section, and further obtains the true flow of the entire flow cross section.

[0059] The above measurement principle is similar to the active remote sensing measurement technology of high-resolution radar, and the difference is that the present application adopts continuous pulse high-frequency ultrasonic waves, while the radar remote sensing adopts pulse electromagnetic waves.

[0060] The radar pulse electromagnetic wave has a long transmission distance and is easily affected by electromagnetic noise, so noise equalization processing is needed, and the process is complex. Moreover, the highest resolution of the reflector is 5nm, and the measurement accuracy has reached the limit. The present application adopts a flow detection method of near-distance ultrasonic wave transmission, is not affected by any electromagnetic wave interference in the transmission process, has high signal-to-noise ratio and high detection accuracy.

[0061] The present application adopts high-frequency continuous pulse ultrasonic cross-correlation flow detection technology, reasonably arranges the online flow detection system of all water lines and sludge lines of the biochemical tank unit of the sewage plant, and illustrates the installation and maintenance method of the detection equipment, so that accurate flow detection results can be obtained, which can be used as the big data base for efficient and energy-saving operation of the sewage plant, and economic and energy-saving help the digital transformation and green and low-carbon development of the sewage plant.

[0062] When the channel flow rate is <1m / s, the measurement inaccuracy is ±0.5% of the measured value + 5mm / s; when the channel or open channel flow rate is >1m / s, the measurement inaccuracy is ±1% of the measured value.

[0063] The above detailed description of the preferred embodiments of the present application. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A channel-type online monitoring device for the concentration and flow rate of sludge in a wastewater treatment plant, comprising a biological treatment tank (1) and a secondary sedimentation tank (2); the secondary sedimentation tank (2) is equipped with a radial flow full-bridge scraper, and an external sludge and residual sludge pump well (3) is provided on the outer wall. The radial flow full-bridge scraper removes the sedimented sludge from the bottom of the tank and discharges the sedimented sludge into the external sludge and residual sludge pump well (3); the external sludge and residual sludge pump well (3) is equipped with a sludge external return pump (3.1); the sludge external return pump (3.1) returns the sludge (8.7) in the residual sludge pump well (3) to the biological treatment tank (1) through a sludge external return pipe (3.2); characterized in that: The biochemical tank (1) is equipped with a sludge external return channel (12), which is connected to the sludge external return pipe (3.2). The sludge external return channel (12) is used to return the sludge (8.7) to the corresponding biological treatment tank (1); A wedge-shaped ultrasonic sensor (8.1) is installed inside the sludge external return channel (12); The wedge-shaped ultrasonic sensor (8.1) scans the sludge (8.7) in the sludge external return channel (12) and converts the scanning result into an electrical signal and uploads it to the wastewater treatment plant control room. The sludge external return channel (12) is equipped with a weighted pad (8.3); The wedge-shaped ultrasonic sensor (8.1) is fixedly connected to the weight pad (8.3) below, and the weight pad (8.3) is submerged at the bottom of the sludge external return channel (12); The wedge-shaped ultrasonic sensor (8.1) is placed in the channel by a weight pad (8.3) and will not be washed away by the water flow. The counterweight pad (8.3) is connected to the stainless steel hook (8.8.6) on the bank of the sludge external return channel (12) via a stainless steel chain (8.8.7); The stainless steel chain (8.8.7) is equipped with a chain tensioning device (8.8.8); The wastewater treatment plant channel-type external return sludge concentration and flow rate online monitoring device adopts high-frequency continuous pulse ultrasonic cross-correlation flow detection technology. At the same time, it captures suspended particles in 16 layers of the flow section. Using the echo mode of suspended particles in each layer, the flow rate of each layer is obtained through a related inversion algorithm. Then, based on the geometric properties and size of the flow section, the flow rate of each layer is superimposed to obtain the true flow rate of the entire flow section.

2. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type external return sludge according to claim 1, characterized in that, The wedge-shaped ultrasonic sensor (8.1) is connected to the field instrument control cabinet (8.2) located on the bank of the sludge external return channel (12) via a power supply and control cable (8.4), and the electrical signal is uploaded to the central control room of the sewage treatment plant through the field instrument control cabinet (8.2).

3. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type external return sludge according to claim 2, characterized in that, The power supply and control cable (8.4) is fixed to the bottom and inner wall of the sludge external return channel (12) by multiple stainless steel pipe clamps (8.5).

4. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type external return sludge according to claim 1, characterized in that, The sludge return channel (12) is equipped with a suspension hoist (8.8) on the top of the pool along its bank; The overhead chain hoist (8.8) is fixed to the bank of the sludge return channel (12) by foot (8.8.2); The foot (8.8.2) is provided with a rotating adjustment disc (8.8.3) and a stainless steel straight rod (8.8.4) in sequence.

5. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type external return sludge according to claim 4, characterized in that, The upper end of the stainless steel straight rod (8.8.4) is provided with a stainless steel inclined support rod (8.8.5) including a lifting nylon pulley; The stainless steel inclined support rod (8.8.5), including the lifting nylon pulley, is fitted with a stainless steel catenary (8.8.1); When maintaining the sludge external return channel (12), the position of the stainless steel inclined support rod (8.8.5) is adjusted by the rotating adjustment plate (8.8.3), and the wedge-shaped ultrasonic sensor (8.1) is suspended by the stainless steel suspension chain (8.8.1).

6. The detection method of the online monitoring device for concentration and flow rate of wastewater treatment plant channel-type external return sludge according to claim 1, characterized in that, The wedge-shaped ultrasonic sensor (8.1) emits ultrasonic pulses (8.6) with a fixed angle range every 1 to 10 milliseconds to scan the sludge (8.7), collect the positions of 16 layers of micro-particle reflectors in the sludge (8.7), and save the obtained echoes as images or electrical signals in echo mode and upload them to the wastewater treatment plant control room. The wastewater treatment plant's central control room detects and calculates flow rate and concentration by comparing the relationships between multiple images or echo patterns ordered chronologically, based on the location of the identified 16 layers of micro-particle reflectors.

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